Narrowing of the arterial interior diameter due to buildup of lipids is ____.

A) atrial fibrillation
B) atherosclerosis
C) a blood clot
D) arrhythmia
E) angioplasty

Narrowing of the arterial interior diameter due to buildup of lipids is a characteristic of atherosclerosis. Atrial fibrillation, arrhythmia, and a blood clot are not directly related to lipid buildup in the arteries. Angioplasty may be used to treat atherosclerosis, but it is not a description of the condition itself.